Process for the production of coke.



LEON FBANCK, OF LUXEMBURG, LUXEMBURG.

PROCESS FOR THE PRODUCTION OF COKE.

Io Drawing.

Specification of Letters Patent Application sled January 6, 191.4. semi. No. 810,675.

Patented May 26,1914.

To all whom it may concern Be it known that 1, Lion FRANcK, chennst, a citizen of Luxemburg, residing at Luxemburg, Grand Duchy of Luxemburg, have mvented certain new and useful Improvements in Processes for the Production of Coke, of which the following is a specification.

This invention relates to a process for the production of a special coke which is to be used more particularly for the manufacture of basic pig iron.

As is Well known, a coke suitable for blast-furnace use, should have sufficient rigidity and hardness with a minimum quan tity of ash,.and be as free as possible from detrimental sulfur compounds. It has been found that the rigidity of the coke increases according to the content in the coke of carbids, phosphids and silicids of iron and of manganese. Sulfids of iron, however, detrimentally affect the properties of coke.

Now phosphorus has the property to drive off sulfur from sulfurous iron in which action ferro-phosphorus is formed. By adding phosphorus compounds such as lime phosphates to the coal prior to coking, phosphorus is introduced into the mixture to such an extent that the iron contained in the ash is converted into ferro-phosphorus, and on being deprived of the sulfur does not take up any further sulfur. The sulfur is rendered volatile and is absorbed and bound by the lime of the decomposed lime phosphate. Suitable phosphorus compounds of lime for this purpose are phosphoritc, phosphate chalk, apatite, vivianite and the like. If, moreover, an addition is made to the mixture, prior to coking, of manganese ore such as manganese di-oxid, the oxygen liberated at the moment at Which the di-oxid is decomposed brings about arapid combustion. As this moment fairly colncides with the formation of the organic sulfur compounds, the latter are oxidized by the oxygen and carried away 'With the gases. By means of this process a hard incompressible coke with a normal content of ash is obtained on the one hand, and on the other hand the sulfur is partly driven out from the coal and partly is rendered harmless. Finally, a coke is obtained which is of high value for the manufacture of basic pig iron since it also offers in addition to carbon, manganese in a partly reduced form, and phosphorus in combined form.

much p The additions of phosphates are calculated according to the content of iron and sulfur in the coal; if desired where the content of iron is too low it may be increased by the addition of ferro compounds.

The following examples show how the invention may be carried out.

Example 1: The coal used for the production of coke contained: iron 1.00%, lime 0.32%, sulfur 0.12%. For binding the iron to phosphorus a phosphate containing 8% of phosphorus, 31% of lime and 2.8% of iron was used. For binding the iron contained in the phosphate 0.75% of phosphorus is necessary; consequently the phosphate contains of the above mentioned phosphate are required. With a Belgian or French phosphate chalk with approximately 4t% of phosphorus, the addition will amount to 7.5% approximately, using the above mentioned coal. If it be desired that the content of ferro-phosphorus be increased and a still more rigid 4% approximately and hard coke be obtained thereby, iron compounds are added in the proportion of 1% of iron per 0.27% of phosphorus. Iron, however is adapted to bind three times as hosphorus, as its lowest phosphate contains; consequently an excess of phosphorus can not be detrimental.

Example 2: Assume that a coke is to be produced, which shall contain, besides phosphorus, 1.4% of manganese. Coal as used in the process according to Example 1 is used. The manganese ore contains about 50% of manganese and 5% of iron. Consequently 2% of ore must be added to the coal, which contains about 30% of volatile components. Iron and manganese are to be transformed into phosphids. The addition of phosphate depends consequently upon the iron content of the coal and upon the iron and manganese content of the manganese ore added. In the presentinstance 102 kg. of a mixture of coal and manganese ore O.27 1.1=0.3 kg. approximately of phosphorus is required. For binding 1 kg. of manganese as a phosphid about 0.37 kg. of phosphorus is required according to the formula Mn P The total phos-- phorus required is therefore O.30+0.37:O.67 kg.

for 102 kg. of a mixture of coal and manganese ore. The amount of phosphate (containing 8% of phosphorus, 31% of lime, and 2.8% of iron) required is therefore or 9.3 kg; approximately for 102 kg. of a mixture of coal and manganese ore.

\Vhat I claim is:

1. The process for making pressure-sustaining coke containing a minimum of detrimental sulfur constituents, from coal, comprising adding to the coal before coking a phosp orus compound of lime, and coking said mixed mass.

2. The process for making pressure-sustaining coke containing a minimum of detrimental sulfur constituents, from coal, comprisin adding to the coal before coking a phosphorus compound of lime, and a manganese oxid, and coking said mixed mass.

8. The process for making pressure-sustainin coke containing a minimum of detrimentaT sulfur constituents, from coal, comprising adding to the coal before coking a phosphorus compound of lime and a sulfurdisplacing agent, and coking the mixed mass.

In testimony whereof I afiix my signature in presence of two Witnesses.

LEON FRANCK.

Witnesses 2 EMMANUEL SERvrUs, HEMMERING. 

